banshee#44 Posted January 20, 2010 Report Share Posted January 20, 2010 ok here's whats up my dad has a 2005 honda 450er . All he has is a slip on yoshimura exhaust (no header). When you try to start his bike up it's like it catches and then dies with a very loud clunk and his batter is fully charged. when you do get it started it will idle for a second and then die usually making a lound clunk. is it also backfires like crazy when you let off the throttle,and we cleaned the carbs recently. So if any of you can help that would be great and much apriciated thanks. Quote Link to comment Share on other sites More sharing options...
00sheerzr Posted January 20, 2010 Report Share Posted January 20, 2010 ok here's whats up my dad has a 2005 honda 450er . All he has is a slip on yoshimura exhaust (no header). When you try to start his bike up it's like it catches and then dies with a very loud clunk and his batter is fully charged. when you do get it started it will idle for a second and then die usually making a lound clunk. is it also backfires like crazy when you let off the throttle,and we cleaned the carbs recently. So if any of you can help that would be great and much apriciated thanks. i had a problem like that with an old warrior , check the valves and cam chain,my chain tensioner let go on my and the chain jumped a few teeth Quote Link to comment Share on other sites More sharing options...
yamaha04 Posted January 20, 2010 Report Share Posted January 20, 2010 would the klunk be the motor just kicking back when it dies and the non start be a jetting issue. if it backfires i would think jetting if it ran good before the pipe Quote Link to comment Share on other sites More sharing options...
dunner250 Posted January 26, 2010 Report Share Posted January 26, 2010 your to lean or a fuel problem. Try going up a couple of sizes in jetting. Also make sure the fuel is getting to the carbs. Pull the gas line off at the carb and turn the gas valve to on and see if gas flows out to see if there is any blockage. Quote Link to comment Share on other sites More sharing options...
krispy05shee Posted January 26, 2010 Report Share Posted January 26, 2010 is the airbox lid on or off? take it off and try that if its on... if that makes any diffrence open the fuel screw on the bottom of the carb. air flow is a MAJOR factor on 450s in my lil experience with them.... Quote Link to comment Share on other sites More sharing options...
MatHolland Posted January 26, 2010 Report Share Posted January 26, 2010 check your valves!!! If you keep doing this your gonna rip the starter clutch out of it. sounds like it could def. be a jetting issue. if your airbox lid is off, get the HRC kit. put the 162 main in, the 48 pilot, and the 55 leak jet. put the clip on the needle in the middle position. then test it. make sure you check those valves first. Quote Link to comment Share on other sites More sharing options...
broncbob Posted January 26, 2010 Report Share Posted January 26, 2010 If you have never done the valves, now's a good time to check them! Hard starting is one of the first clues. Your lean on the fuel screw for sure it sounds like. What is your jetting at now, and is the air box lid on or off? What is your elevation? Have you ever had it on a dyno to be tuned? The FCR carbs can be a huge pain in the ass. Every letter on the needle is in reference to a different section on the needle, and they all go from A to Z it seams like! Does it have a low end bog? The starter clutch is know to take a dump if you have cranked on it for long periods of time. I'm not sure if your carb is set up for a hot start, but if it is, get the cable, plunger, and thumb lever. It really helps starting them when warm. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted January 27, 2010 Report Share Posted January 27, 2010 If you have access to a leak-down tester it would be a good idea,this can let you know alot without taking anything apart,use the guage and see if there is air seeping out of your carb/exhaust/etc,your intake side is a shim under bucket design and wears oppisite from conventional set-ups,cam chain tensioner is possible but unlikely inless your messimg with or didnt install it properly By the way most 450rs end up 185-195 main,no lid,full ex 50 pilot with some motor work stock needle will tune out if your patient Quote Link to comment Share on other sites More sharing options...
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